Patrick Kelley/AP Photo

HOUSTON - At a private fundraiser in Texas today, Mitt Romney took a swipe at President Obama's campaign spending habits, remarking that his own campaign has been "a little wiser" in how they've spent their money.

"I'd like you to commit to find a few people that voted for Barack Obama to vote for me," said Romney at a fundraiser held at The Houstonian Hotel in downtown Houston, the former residence of President George H. W. Bush. "And by the way, continue to help out with your dollars. It means a great deal to me."

Get more pure politics at ABCNews.com/Politics and a lighter take on the news at OTUSNews.com

"You've perhaps noticed in the paper, we're a little wiser in our spending of dollars than the other side, apparently," said Romney. "I'm not managing their campaign for them, but we're going to spend our money wisely, we're going to spend it to win."

Romney's remark comes after financial documents filed Monday by the two campaigns showed that for the third straight month, Obama's campaign has spent more than he brought in. In July, for example, Obama's campaign raised $49.1 million but spent $58.8 million. The Obama campaign also has $2.8 million in debt.

Romney's campaign remains debt-free, raising $40.3 million in July and spending $32.6 million.

Romney's campaign, joined with the Victory Fund and the Republican National Committee, had $185.9 million in cash on hand at the end of July, beating out Obama by $60 million, who had $126.7 million on hand between its various fundraising arms.

Romney's fundraising swing today in Texas - which includes three finance events in Houston and Midland - are expected to raise between $6 and $7 million, according to a campaign aide.

ABC News' Devin Dwyer contributed to this report