Who makes better candidates — moms or dads? And more broadly, what impact do both the gender and parenting status of candidates have on their chances to win an election? An experimental online survey by the Pew Research Center suggests that the answer depends, in no small part, on whether you are a Republican or a Democrat. The study used four separate random samples of more than 500 registered voters each, for a total of 2300 voters overall. It was conducted before the selection of Alaska Gov. Sarah Palin as the Republican vice-presidential candidate.