Wealthy businessman Jack McDonald (D), who is exploring a possible bid against Rep. Michael McCaul (R) in the 10th district, announced Wednesday that he raised more than $300,000 in five weeks of fundraising before Tuesday’s first-quarter Federal Election Commission filing deadline.

McDonald, who runs the Perficient information technology company, formed an exploratory committee in late February. He said Wednesday that besides a $500 loan he made to open his account, all of the more than $308,000 he raised in the past five weeks came from third-party contributors.

“We’re humbled by the tremendous support we’ve received from Texas Democrats, Independents and Republicans, particularly given these tough economic times,— McDonald said in a statement.

Democrats held McCaul to 54 percent in 2008 in this barbell-shaped district that stretches from greater Houston’s solidly conservative Harris County in the east to Austin’s Democratic-leaning Travis County in the west. After expressing some interest in running for Texas attorney general earlier this year, McCaul has since indicated that he intends to run for re-election in 2010.