SAN JUAN, Texas (AP) Promoters of the federal health care law have spent months crisscrossing border communities in South Texas. They have been speaking to church congregations and making presentations in community centers where some of the nation's largest pockets of uninsured can be found.

They're tasked with explaining an initiative that state leaders have strongly denounced and refused to promote. On Tuesday, trained personnel across Texas will begin seeing how many of the state's 6 million uninsured will seek coverage through the health insurance marketplace during the next six months.

The response in Texas' Rio Grande Valley will be watched to gauge how well the Affordable Care Act aids its intended targets. The Valley has some of the nation's most impoverished communities and more than 300,000 people eligible for coverage through the law.