Though often regarded as a longshot candidate for president, Republican Ron Paul tells ABC News that he has an impressive $2.4 million in cash on hand after raising an equal amount during the second quarter, putting him ahead of one-time Republican frontrunner John McCain, who reported this week he has only $2 million in the bank. 

In an exclusive interview taped Friday and airing Sunday on "This Week," Paul said his campaign is on a better trajectory than McCain's.

"I think some of the candidates are on the down-slope, and we're on the up-slope," said Paul.

Paul's cash on hand puts him in third place in the Republican field in that important metric, although he is well behind leader Rudy Giuliani, who has $18 million in the bank, and Mitt Romney, with $12 million.

Paul, who polls show with support in the low single digits, said his surprisingly strong fundraising is the best measure of his support.

"I think people have underestimated the number of people in this country who are interested in a freedom message," says the Republican congressman from Texas, who has strong libertarian leanings.

Click HERE to watch a clip from the interview.