  We present 100 year light curves of Kepler planet-candidate host stars from
the Digital Access to a Sky Century at Harvard (DASCH) project. 261 out of 997
host stars have at least 10 good measurements on DASCH scans of the Harvard
plates. 109 of them have at least 100 good measurements, including 70% (73 out
of 104) of all host stars with g<=13 mag, and 44% (100 out of 228) of all host
stars with g<=14 mag. Our typical photometric uncertainty is ~0.1-0.15 mag. No
variation is found at 3-sigma level for these host stars, including 21
confirmed or candidate hot Jupiter systems which might be expected to show
enhanced flares from magnetic interactions between dwarf primaries and their
close and relatively massive planet companions.
