Answer:

XED

Answer	Crossword Clue
XED	Crossed (out)
XED	Crossed out
XED	Indicated a mistake

XED	Marked a ballot
XED	Marked wrong
XED	Signed like an illiterate
XED	Deleted
XED	Took out of context?
XED	Took out
XED	Marked on a ballot
XED	Taken out of context?

XED	Chosen on a ballot, maybe
XED	Signed very simply
XED	Marked a box, maybe
XED	Eliminated, with "out"
XED	Like some ballots
XED	Marked simply
XED	Took (out)
XED	Deleted, with "out"

XED	Struck (out)
XED	Signed primitively
XED	Voted for, with "in"
XED	Marked with two lines
XED	Marked, in a way
XED	Struck (out) of the text
XED	Marked the spot
XED	Selected on a ballot, with "in"

XED	Filled (in), as a questionnaire box
XED	Marked off, in a way
XED	Marked wrong, in a way
XED	Crossed through, with "out"
XED	Marked, as a ballot
XED	Made a mark in the box
XED	Marked a ballot, perhaps
XED	Struck out

XED	Crossed off
XED	... out (canceled)
XED	Made one's mark
XED	Marked, as some ballots
XED	Struck