GOP-allied groups heavily outspend Democrats in special Pennsylvania election
Republican-allied groups have dramatically outspent their Democratic rivals 17-to-1 in the first congressional race of 2018, a special election in Pennsylvania that both parties cast as a potential bellwether for the November midterms. Four conservative groups have purchased $4.7 million in television and radio ads to help state Rep. Rick Saccone, their candidate for the Pittsburgh-area seat held until last year by disgraced former GOP Rep. Tim Murphy, according to Feb. 2 numbers provided by strategists involved in the race.
http://www.topix.com/us/politics/2018/02/gop-allied-groups-heavily-outspend-democrats-in-special-pennsylvania-election
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In a special election we can blitz with activists from all over the country, though how you overcome 17 to 1 remains to be seen.
In a general election, anything competitive needs local people for the blitz, so we can only flood to a lesser extent.