Proving that an argument is invalid (ideally by showing that it ends in a logical contradiction) is one of the most effective ways to destroy an opponent's case.

WASHINGTON -- During a fundraising swing through Minnesota on Thursday, Mitt Romney offered an assessment of the business landscape that complicates t...

WASHINGTON -- The Obama campaign has released a new ad in several battleground states that rebuts attacks against the president for his much-maligned ...

WASHINGTON -- President Barack Obama's top campaign adviser David Axelrod went after Mitt Romney on Sunday for his recent comments about teachers, say...

The Mitt Romney campaign, unsurprisingly, isn't dropping President Barack Obama's recent remark that the private sector is "doing fine." It released a...

WASHINGTON -- President Barack Obama, seeking to clarify comments about the strength of the U.S. economy, said later Friday it is "absolutely clear" t...