WASHINGTON — Hillary Clinton made a direct appeal to young voters to get “off the sidelines” and behind her candidacy with an unusually personal address Monday, conceding she has to overcome doubts that they – and others – still harbor toward her even as they also reject her Republican opponent.

Speaking to 300 students at Temple University in Philadelphia, Clinton acknowledged the difficulty of transitioning from a supporting role and service in nonelected offices to advocating for herself as a candidate.

The address was part of a larger effort by Clinton’s campaign to refocus on substance rather than a daily tit-for-tat with Donald Trump.

Her address revealed the degree to which Clinton’s challenge goes beyond persuading voters to reject Trump to persuading them to overcome frustration with politics or with her that may lead them to vote for a third-party candidate, or not vote at all.