A Democratic official pointed out that 2008's reference to God was not specifically about faith, but rather about growing the middle class, and that the 2012 language specifically referring to faith was identical to 2008's document.

Meanwhile, Ryan continued to be hounded by factually challenged statements in his convention speech last week, coming out again Tuesday to defend a remark that appeared to blame Obama for the closure of a General Motors plant in Janesville, Wisconsin. An announcement that the plant would close preceded Obama's election.

"What I was saying is the president ought to be held to account for broken promises," Ryan said on NBC. "After the plant was shut down, he said he would lead efforts to restart the plant. It's still idle."

The Romney campaign reached out to reporters on Monday to point out that, during his Labor Day remarks in North Carolina, Ryan inaccurately described the number of bankruptcy filings under Carter when he was comparing his record to Obama.

Ryan also addressed his erroneous claim to have run a three-hour marathon in the past.

"I thought I ran an ordinary, kind of normal time, and I thought that was an ordinary time, until my brother showed me a three-hour marathon is crazy fast," Ryan responded when asked about the marathon claim in an interview with WTOL. "I ran a four-hour marathon. And so it's just the fact that I did this 22 years ago, and I forgot what my time was and that's what I thought it was."