Why do some people tend to vote more than others? And what influences their choice of candidate?

According to the Pew Research Center (see the link below), people who vote intermittently are less likely to be married than those who vote regularly. They are also more likely to feel distrustful towards others, and they express less (not more) anger at the government. Intermittent voters, who don't always vote in elections, are less likely to know much about the candidates, and they report feeling bored about what goes on in politics. These voters are the most likely group to swing between candidates, and they tend to be less educated and less affluent than regular voters. People who don't vote at all or who are not even registered to vote, according to the Pew Research Center, don't believe that voting will make a difference and don't feel guilty about not voting. 
Who people vote for is influenced by several factors, including the voter's background. For example, African-Americans tend to vote for Democrats, and more women than men voted for Hillary Clinton. When John Kennedy, who was Catholic, ran for President, a majority of Catholic voters cast their votes for him. In addition, people's party identifications influence who they vote for, as people who are registered as Democrats tend to vote Democratic, while those registered as Republicans vote Republican. In addition, a voter's ideology affects their voting, as those who are more liberal tend to vote for more liberal candidates, while those who are more conservative seek out conservative candidate. Finally, people evaluate a candidate's personal characteristics, and their perceptions of the candidates' honesty and other personality factors influence their voting.  
https://www.icpsr.umich.edu/icpsrweb/instructors/setups/voting.jsp

https://www.people-press.org/2006/10/18/who-votes-who-doesnt-and-why/