Green Party presidential candidate Jill Stein speaks at a news conference across the street from Trump Tower on Dec. 5 in New York City. (Drew Angerer/Getty Images)

Regarding the Nov. 29 news article “Stein files petition for recount in Pa.”:

Twice in the past five elections, the Green Party may bear responsibility for changing the outcome of a presidential election. Despite Jill Stein garnering less than a third of the votes that Libertarian presidential candidate Gary Johnson received, Green Party votes were indeed the difference in three Rust Belt states. In Michigan, Wisconsin and Pennsylvania, President-elect Donald Trump’s margin of victory was less than Green Party presidential candidate Jill Stein’s vote count. A difference of about 80,000 votes determined the outcome in these three states.

Mr. Johnson won far more votes but polls suggest he drew nearly equally from Mr. Trump and Democratic presidential nominee Hillary Clinton. This cannot be said for Ms. Stein’s voters, who would have likely been almost exclusively Democratic voters. The difference this year dwarfs the 537-vote deficit that cost then-Vice President Al Gore Florida and the presidency in 2000, but it is still real.

Theodore Roosevelt cost Howard Taft the election in 1912. Since 1912, third-party candidates have come and gone. None had any impact on the electoral outcome through 1996. Not the Progressive Party, the States’ Rights Party, George Wallace or even Ross Perot. All they did was make it harder for the winning candidate to win — until the year 2000 and now 2016.

Greg Grapsas, Olney