HARRISBURG – Contested area state Senate races: In the 13th District, Republican incumbent Scott Martin is in the lead over Democrat Janet Diaz. In the 15th District, Republican incumbent John DiSanto is ahead of Democrat George Scott. In the 31st District, Republican incumbent Mike Regan is leading Democrat Shanna Danielson. And in the 33rd District, Republican incumbent Doug Mastriano is ahead of Democrat Rich Sterner.