The Brighton Kemptown candidate told the Argus: “About a week ago I had ‘Tory scum’ written on the front window of my abode in the dirt there. Since that time I also have also had dog excrement repeatedly thrown on to my front porch and somebody has also been coming by and stamped on it.
“With the graffiti I crossed out ‘Tory’ in favour of ‘Brexit Party’ and added the words ‘get it right’.
“However the dog excrement business is continuing.”
Mr Cushway told the paper that a limited number of people knew his address.
He said: “My details are not publicly available.
“Therefore the perpetrator must either have acquired this knowledge from somewhere or from an individual with access to privileged information.”
However the 16-year Army veteran says he is “not easily threatened” by the “fairly futile exercise”.
He said: “I did six years in Iraq including being in Fallujah for the Third Battle of Fallujah.
“I was then moved to Baghdad to participate in The Surge there, and was later in the country for the invasion by the Islamic State.
“The whole incident has further convinced me of the anti-democratic nature of my adversaries and the necessity to change politics for good.”
Mr Cushway will challenge sitting Labour MP Lloyd Russell-Moyle for the Brighton Kemptown constituency.
Other candidates include Conservative councillor Joe Miller, current Mayor of Brighton and Hove Green MEP Alex Phillips, Ben Thomas for the Lib Dems and provisionally selected Guy Pratt has been provisionally selected to represent Renew.
Britain is set for a general election on December 12 after Boris Johnson finally won Commons approval to put his Brexit deal to the voters last night.
At the fourth attempt, the Prime Minister was given the go-ahead for the early poll after Labour leader Jeremy Corbyn caved in and dropped his resistance.
Voters now face the first December election in nearly a century as long as the Lords rubber-stamp the decision today.
Mr Johnson now heads into the election as the favourite to win after recent polls gave the Tories a lead of up 16 points over Labour.