(CNN) - Harry Reid launched another barb at the Republican ticket from the Senate floor, this time poking fun at Rep. Paul Ryan over the vice presidential nominee's marathon time snafu.
"I want to take just a moment and talk about Congressman Ryan's math," Reid said Monday. "His arithmetic–it's very interesting."
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The congressman misstated his race time by more than 60 minutes while speaking on a radio program last month, saying he had finished the race in an impressive time of under three hours.
While he's known as a fitness junkie, the time still seemed questionable and Ryan admitted his mistake last week after a running magazine found that it took him more than four hours to complete the 1990 Minnesota race. He attributed the mental lapse to the passage of time and a back injury.
"I literally thought that was my time. It was 22 years ago," he said in a separate radio interview. "You forget sort of these things. I hurt my back when I was in my mid twenties, so obviously my perception of races and times were off."
But the Senate majority leader–whose term lasts through 2016–joined in on what's become a political punch line in the last couple of weeks and poked fun at the congressman's mistake.
"I ran the Boston marathon, and using the Ryan math, my time would not have been a world's record but within minutes, minutes of a world record," Reid said. "I could have made the Olympic team. Using the Ryan math, I would have been superb."
The Democratic leader has not been shy in mounting attacks this cycle. Reid stirred controversy when he took to the Senate floor last month to defend his allegation that Mitt Romney had not paid any taxes for 10 yeas–information he said he received from an "extremely credible" source associated with Bain Capital.
Responding, Romney questioned Reid's source and called on Reid to either "put up or shut up." The Republican presidential nominee said he had no plans to release further tax information than what he's already made public: one completed return from 2010 and an estimate for 2011. He has vowed to release the full return once it's ready.
Last week, Reid again hounded Romney over his tax returns while speaking at the Democratic National Convention in Charlotte, North Carolina.
"Mitt Romney says we should take his word that he paid his fair share. His word? His word? Trust comes from transparency, and Mitt Romney comes up short on both," the lawmaker said.