Would it be on topic to ask a question in the form
"Which candidates running in the US (Republican|Democratic) presidential primary for 2016 has expressed support for X position?"
"Which candidate running in the US (Republican|Democratic) presidential primary for 2016 has taken the strongest stance supporting X position?"
The first seems dubious because it could end up with a long list and multiple correct answers.
The second seems dubious because it's somewhat subjective, but I like it better because the answerer could make a short case between a few contenders based on voting records and quotes from speeches.
Is there a better way to ask this kind of question for voters who feel strongly about a particular policy position?