A new poll shows former Gov. Charlie Crist holding an early edge in a crowded St. Pete mayoral field that includes incumbent Ken Welch. Crist leads Welch in a hypothetical head-to-head General Election matchup and in a Primary field, with Welch securely in the No. 2 spot. The survey found 23% of residents polled would vote for Crist if the election were held today, followed by 19% supporting Welch. No other candidate even hit double-digit suppo…