Former Wisconsin Gov. Tommy Thompson on Sunday joined the crowded field of Republicans running for the White House in 2008. "I am the reliable conservative," he asserted. Thompson, who was health and human services secretary during President Bush's first term, also said he is the only GOP candidate who has helped assemble both a state and federal budget. Since announcing last year he was forming a presidential exploratory committee to raise money and gauge support, Thompson has lagged behind better-known rivals. Asked Sunday whether he was running for president, Thompson said, "That is correct." Thompson, 65, has focused his strategy...