As the Republican U.S. Senate primary heads into its final 10 days, many voters are now paying attention - just in time for a blast of critical ads aimed at undecided voters. Doug Gallagher, a wealthy Miami business executive, launched a radio ad calling himself a "successful businessman" and labeling rivals Bill McCollum and Mel Martinez "the M&M boys." He called McCollum "a lobbyist beholden to special interests" and Martinez the "president of the trial lawyers." "We've tried it their way. Now let's try it our way," says Gallagher, who is financing his campaign with nearly $6-million of his own...