WASHINGTON — Republican voters like the preliminary peace deal with Iran less the more they know about it, according to a new poll shared exclusively with The Post. Initially, registered Republican voters backed the deal by a margin of more than three-to-one (62% to 20%), according to the survey by J.L. Partners. But after hearing details of the memorandum of understanding signed by President Trump last week , just 32% deem it a “good deal” while 44% pan it as a “bad deal,” with another 15%