If Gov. Ron DeSantis is voted into the White House, he has made it a cornerstone to carry himself above reproach. That was on display when he fielded audience questions in an Iowa town hall. When asked by moderator Kaitlan Collins about the limits of power as president and former President Donald Trump’s contention that he deserves immunity from prosecution — the Florida governor made it clear he would govern with principle and a strict respect to the Constitution and nothing more. POLL: Should Trump be allowed to run for office? “If you nominate me, I’ll get elected, I’ll serve, and we won’t …