A straight party vote is a vote for all candidates of that party in partisan races. If you vote straight party, a vote will be recorded for each candidate of the party you select. If you mark the straight party box, but also mark the box next to a candidate from a different party lower on the ballot, the individual vote in that race will overrule the straight party choice in that race only. You will still need to mark non-partisan races such as judicial retention and any ballot questions if you want a vote counted in those races.