A day after their contentious Pennsylvania debate, Sens. Hillary Clinton and Barack Obama both appeared on Comedy Central’s The Colbert Report.

Host Stephen Colbert remarked that former North Carolina Sen. John Edwards - who dropped out of the race before Super Tuesday - won the debate.

In any event, Obama’s addition to Colbert’s famed “On Notice” board, where he calls out various people and inanimate objects that have drawn his ire, got us thinking of all the stuff we’d like to put on notice lately.

Thanks to this terrific On Notice board generator, we were able to!

1. The McCain Girls were outed as a hoax. Which is funny, but also sad, as we were hoping they really were that unfunny.
2. Forget rural Pennsylvania voters clinging to guns or religion… how effing annoying is it when your socks stick to the rest of your clothes when you take them out of the dryer?
3. Ah, bad credit home loans. Two years ago, a gateway to homeownership, now the scourge of the financial world. Way to get greedy and screw over the whole country, Florida mortgage brokers.
4. The 27 million (to date) Democratic primary voters only represent 3,253 of the 4,049 delegates to the convention. The 796 “superdelegates” are thus 33,913 times more important than you. Let’s hear it for democracy!
5. Not only were George Stephanopoulos’ debate questions dreadful, but his name is so hard to spell, it costs us valuable blogging time daily.
6. As liberals, the obligatory remarks about Ralph Nader costing Al Gore the White House in 2000 will surface from time to time. Deal.
7. Really, Cindy McCain? The Food Network? You don’t have friends you can steal recipes from like everyone else?
8. Forget the ’60s radical group… the ’00s iteration of Weather Underground never gets its forecasts right more than 24 hours in advance.

The youngest member of the Democrats’ last First Family turns 28 today, and Donkey Dish would like to wish Chelsea Clinton a happy birthday!

The former - and possibly future - First Daughter has certainly come a long way since the early ’90s, when she spent every human’s most dreadful years - early teenage-hood - in the grandeur of the White House.

Two college degrees and several high-powered jobs later, Chelsea Clinton has become an exceptional young woman - and in the 2008 campaign, a prominent fixture in her mother’s bid for the White House.

Chelsea Clinton watches her mother, New York Sen. Hillary Clinton, at her debate in Cleveland with Illinois Sen. Barack Obama last night.

For a closer look at the only child of Bill and Hillary, check out our bio of her as well as our gallery of past and present Chelsea Clinton photos.

[NOTE: In other political birthday news, but which many Democrats would rather ignore, third-party mainstay Ralph Nader turns 74 today]

With the announcement that Ralph Nader is seeking the White House for the fifth time, Al Gore may have rolled over in his grave.

No, Al Gore isn’t actually deceased, but in the opinion of many Democrats, the death of his presidential hopes in 2000 came at the hands of one man - and that man is not named George W. Bush.

Siphoning more votes in several states than the margin by which Gore lost to Bush, Nader’s third-party candidacy may have swung the election to the Republicans eight years ago. Resentment lingers.

Nevertheless, Nader is once again entering the race as an independent, he announced Sunday, calling for a “Jeffersonian revolution.”

Ralph Nader, 73, explained the nature of his bid on NBC’s Meet the Press:

“Big money and the closing down of Washington against citizen groups prevent us from trying to improve our country. And I want everybody to have the right and opportunity to improve their country.”

Both Democratic contenders were quick to jump on Ralph Nader.

Calling Nader’s unsurprising entry into the race “very unfortunate,” Sen. Hillary Rodham Clinton said, “I remember when he ran before. It didn’t turn out very well for anybody - especially our country.”

“This time I hope it doesn’t hurt anyone. I can’t think of anybody that would vote for [John McCain] who would vote for Ralph Nader.”

Sen. Barack Obama offered similar criticism:

“He thought that there was no difference between Al Gore and George Bush and, eight years later, I think people realize that Ralph did not know what he was talking about,” he said.

While he praised Ralph Nader for doing “as much as just about anyone for American consumers” Obama said he is somebody who, “if you don’t listen and adopt all of his policies, thinks you’re not substantive.”

Nader called Barack Obama “a person of substance” but chastised him for “censoring his instincts” on some divisive issues.

What impact will this have on the race? Hopefully none. But a third-party bid invariably means potentially playing spoiler to someone.

Hypothetically (though with less of an impact), Ralph Nader’s bid is the equivalent of Ron Paul launching a libertarian run - which he won’t do.

For this reason, Democrats can’t help but feel queasy, even if both Clinton and Obama are strong candidates and backlash from Nader’s 2000 run will prompt fewer liberals to choose him again.

The past is the past, and Ralph Nader won’t gain much traction here in 2008. But when you consider what could have been - Al Gore being president for the past eight years - it’s hard not to dwell.