This week on FlackCheck.org:

• The McClellan campaign’s newest attack ad dismisses the Homestead Act, signed by President Lincoln, as an un-American redistribution of wealth.

• Find out who called Rep. Kristi Noem (R., S.D.), the Tea Party and “D.C. insiders” horses’ asses; who smashed a piñata with South Carolina Gov. Nikki Haley’s face on it, and who accused Bain Capital of “raping companies.”

• See if you can spot the difference in a photo used in two campaign mailers sent out by Rep. Brad Sherman (D., Calif.), then decide whether this is a case of media manipulation.

• Takedowns of two Crossroads GPS ads containing misleading attacks against President Obama (Click here and here).

• Learn how some deceptive super PACs hope TV stations will treat their ads (then contact your local stations urging them to stand by their ads).

• View our video highlighting a fact check by Calvin Woodward of the Associated Press on Vice President Biden (“audacious” acts).

• Orchids go to CNN’s John King for questioning South Carolina AFL-CIO president Donna Dewitt’s piñata-bashing behavior and to CNN’s Candy Crowley for challenging top Obama campaign adviser David Axelrod on the content of an anti-Romney ad.

• See our Tuesday May 22 panel on fact checking the 2012 election here.