WASHINGTON — Sen. Tom Coburn raised nearly $600,000 in just a few weeks, showing he could attract campaign money quickly after deciding to run for a second term. Coburn, R-Muskogee, reported this week he collected $594,099 between April 1 and June 30, after raising relatively little money in the past few years. Coburn started the period with $57,000 in his campaign account, but ended with $623,451. Coburn, first elected to the Senate in 2004, announced on June 1 he would run for another term in 2010. Before then, he repeatedly said he didn’t want to ask people for money before deciding whether to run again. He also said he wouldn’t have trouble raising money if he decided to seek another term. He proved that, collecting most of the money in the weeks after his announcement. No opposition to Coburn has emerged. Two Oklahoma City Republicans hoping to succeed Rep. Mary Fallin in Congress are building healthy campaign war chests, according to reports filed with the Federal Election Commission. Oklahoma State Rep. Mike Thompson raised nearly $219,000 from April through June and ended the quarter with $178,201 after campaign expenses. Former state Rep. Kevin Calvey raised $144,034 in the quarter and had $257,275 in his campaign coffers by the time the quarter ended. Fallin, R-Oklahoma City, is running for governor next year. Rep. Tom Cole, R-Moore, raised $166,643 in the second quarter of the year and had $453,167 in the bank on June 30, according to his most recent report to the FEC. R.J. Harris, a Republican from Norman challenging Cole, raised $15,023 in the quarter and had $5,396 at the end of June. Rep. Dan Boren, D-Muskogee, had $1.2 million in the bank after raising $158,201 in the quarter; Rep. Frank Lucas, R-Cheyenne. had $321,035 after raising $166,958; and Rep. John Sullivan, RTulsa, had $86,518 after raising $84,987.