There are two types of GOTV efforts. The first type is general voter registration campaigns and encouragement to vote, conducted by electoral authorities or nonpartisan organizations. The second type is partisan work targeted at potential voters who are likely to vote a particular way. For partisans it may be easier and more cost effective to encourage voting by a hundred supporters who did not vote in the past, than it is to convince fifty voters to switch support from one party to the other. This situation can lead to polarized electoral politics. A 70% turnout from a party's committed base can be better than a 50 percent turnout from both committed and marginal supporters.