But the presidency could turn on in-person voting today in several crucial states, with Republicans expected to outnumber Democrats going to the polls on Election Day. First, I tracked the number of presidential and vice presidential campaign visits per county in 2016 and the vote percentage each party won in that county. According to my estimates, Clinton gained 1.2 percentage points at the county level for each visit she made to Pennsylvania. Next, I used the statistical modeling technique of linear regression to figure out whether, and by how much, a candidate's visits were associated with an increase in vote share  after controlling for other factors, such as demographics and past election results in that county. For one thing, campaigns in general don't change many voters' minds; mostly, they reinforce voters' pre-existing partisan or candidate preferences.
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(z0 / bid-01
    :ARG0 (z1 / person
              :ARG0-of (z2 / have-org-role-91
                           :ARG2 (z3 / president)))
    :ARG1 (z4 / staff-01
              :ARG0 z1))
The presidents bid to staff .
z1 :ARG0-of z2
z2 :ARG2 z3
z0 :ARG0 z1
z0 :ARG1 z4
z4 :ARG0 z1