 This was not a universally popular attitude , and in 1909 Dmowski resigned his deputy mandate to focus on an internal political struggle within Endecja . He lost the election to the Fourth Duma in 1912 to a socialist politician , Eugeniusz Jagiełło from the Polish Socialist Party – Left , who won with the support of the Jewish vote . Dmowski viewed this as a personal insult ; in exchange he organized a successful boycott of Jewish businesses throughout much of Poland . 
