Rep. Danny Davis (D-Ill.) filed his petitions to run for Cook County Board president Monday morning, but his office said he will also file to run for re-election to his Congressional seat at a later date. Monday was the first day Illinois candidates could file their petitions and the requisite signatures with the local elections department. Davis has until Nov. 9 to withdraw one of his petitions and pick a race. Davis filed for board president Monday, but his spokesman Ira Cohen confirmed in an e-mail that he will also later submit petitions to run for re-election.“Yes, he will but the date is not yet determined,— Cohen wrote. A well-placed source said Davis was waiting to see which other candidates file for the Cook County Board race before he makes a final decision. If some of the more prominent candidates have trouble getting enough signatures to run, he is more likely to run for Cook County Board president. If Davis decides to leave the House, several Democrats are waiting to run for his seat. The 7th district is heavily Democratic and includes parts of downtown and the West side of Chicago, as well as some western suburbs.