Senate candidate Martha McSally is getting a multi-million dollar boost. DefendArizona, a political-action committee, has reserved almost $5 million in TV advertising for the Congresswoman's bid for U.S. Senate. McSally faces conservative headline maker's former Maricopa County Sheriff Joe Arpaio and former state senator Dr. Kelli Ward in the GOP primary. Polls show McSally with a lead in the Republican race, however Democratic Congresswoman Krysten Sinema, who is expected to win the Democratic race, is leading her GOP challengers.