CNN

The days leading up to the crucial Texas and Ohio primaries have been full of questions and scrutiny for Barack Obama.

First, there are his ties to Chicago businessman Tony Rezko who's now on trial for political corruption. Obama isn't implicated in the case at all, but Rezko contributed 150-thousand dollars over the years to Obama's campaigns, money Obama says has since been donated to charity. Rezko also helped him buy a home and sold a strip of land to Obama – a purchase the candidate characterizes as "boneheaded."

Obama is also denying a report that a senior campaign official assured Canada that the candidate's tough talk on NAFTA is more about "political positioning."

The Canadian Embassy has backed up Obama's version of the meeting, saying that there was no intention to convey that Obama and his campaign were taking different positions on NAFTA in public and private.

But politics is a contact sport, and Hillary Clinton has jumped all over Barack Obama – challenging his credibility and accusing him of deception.

To read more and contribute to the Cafferty File discussion click here