Stretching from St. Augustine south through Flagler County, state House District 19 is solidly Republican. And as House Speaker Paul Renner, R-Palm Coast, prepares to leave the Legislature in November, his exit from the Northeast Florida seat is leading to a big-money battle among Republican candidates who want to succeed him. Newly filed reports detailing campaign-finance activity during the first three months of 2024 show similar patterns in other parts of the state: Open seats in places such as Miami-Dade County, Palm Beach County and Central Florida drew influxes of cash. Read: Florida Rep…