After catching Mitt Romney repeating another obvious falsehood, Greg Sargent noted this afternoon, “I know this risks getting boring and predictable, but we really should document them all.”

That’s a good idea. In fact, I’m thinking about starting a new feature for Friday afternoons, highlighting the Republican frontrunner’s most offensive falsehoods from the previous week. I’m thinking about making it a Top 5 list, but I suppose some weeks, it might be a Top 10 list.

Let’s take a look at this week’s contenders.

1. Romney campaigning in Iowa on Sunday: “[W]hen the president went around at the beginning of his term and apologized for America around the world, it made us just heartsick.”

He’s lying; the president never apologized for America. Romney knows this, but he keeps making the claim anyway.

2. Romney on Fox News on Tuesday: “I’ve still got the same positions on the issues I had four years ago. My record as governor and my positions are pretty darn conservative.”

That’s not even close to being true.

3. Romney talking about his jobs record on Fox News on Tuesday: “[At Bain Capital], we helped create over 100,000 new jobs.”

Actually, no, he didn’t.

4. Romney in New Hampshire on Wednesday said President Obama seeks “a ‘European-style welfare state’ to redistribute wealth and create ‘equal outcomes’ regardless of individual effort and success.”

This isn’t just a lie, it’s also “Glenn Beck-level insane.”

5. Romney in a new campaign ad airing in South Carolina: “The National Labor Relations Board, now stacked with union stooges selected by the president, says to a free enterprise like Boeing, ‘You can’t build a factory in South Carolina, because South Carolina is a right-to-work state.’ That is simply un-American. It’s political payback of the worst kind.”

Romney has said this before, and he’s been told every time, he’s lying.

Honorable mention: Romney continues to make wildly misleading comments about the president’s jobs record, too.

The hosts of CBS’s “The Early Show” this week seemed taken aback when Newt Gingrich called Romney “a liar,” prompting the disgraced former House Speaker to say they shouldn’t be “shocked” given Romney’s constant dishonesty.

As lists like these help demonstrate, Gingrich has a point.

Postscript: I plan to have another installment next Friday afternoon, but if you come across Romney whoppers and want to share them, feel free to email me.