the Puerto Rican constitution s:Constitution of the Commonwealth of Puerto Rico allows for additional members to be added to either chamber to enhance the opposition party's representation. Members of the opposition will be added to provide a minimum of 17 and 9 members of the House and Senate, respectively (one third of the original size). In the last election, 2 and 3 members were added to the House and Senate, respectively. When the majority party polls less than two-thirds of the vote for Governor of Puerto Rico, minority seats in the Senate or the House are distributed using a variant of the Hare quota largest remainder method according to the minority parties' share of the vote for governor, subject to a 3% threshold. A slightly different procedure is provided for in the event the majority party wins more than two-thirds of the vote for governor, which limits each minority party to a number of seats not in excess of its proportionate share of its vote for governor (excluding rounding differences). Additional seats assigned to a minority party first go to defeated at-large candidates with the largest vote totals, and then, if necessary, to district candidates with the largest proportion of the vote who have not been elected (sometimes called the "best loser" system). See also Politics of Puerto Rico Political party strength in Puerto Rico List of political parties in Puerto Rico Notes References External links Elections in Puerto Rico Adam Carr's Election Archive