BOGOTA (Reuters) - Ruling Liberal Party candidate Horacio Serpa finished neck and neck with Conservative Party- backed Andres Pastrana in Colombia‘s violence-plagued elections on Sunday, the National Electoral Board said. With 95 percent of the votes counted, neither had won more than the 50 percent of ballots needed for outright victory, thereby triggering a second round runoff on June 21. The result torpedoed independent candidate Noemi Sanin‘s bid to become Colombia‘s first woman president and end the ingrained corruption of the traditonal two-party system. Serpa garnered 34.45 percent of the vote, compared with Pastrana‘s 34.36 percent, according to the National Electoral Board after 94.88 percent of the total vote was counted. Sanin, a former foreign minister, gleaned 27.02 percent of the votes. The final 5 percent of the ballots was expected to trickle in from some of the more remote corners of Colombia during the evening and overnight. The race was much closer than opinion polls had predicted, since surveys had widely forecast a first-round win for Pastrana. The final tally of votes was expected to come in at around 11 million — a record high for any Colombian election.