PORTLAND, Maine (AP) — Maine Republican Sen. Susan Collins, a moderate who is no stranger to difficult reelection campaigns, is seeking a sixth term Tuesday as Democrat Troy Jackson tries to help his party take control of the Senate for the rest of Donald Trump’s presidency. Jackson is a former Maine Senate president who took over as the Democratic nominee in July after primary winner Graham Platner dropped out. He is tasked with defeating a longtime incumbent after a chaotic primary season that left the Democrats in disarray and briefly without a candidate. It’s a race Democrats see as a...