WASHINGTON — Democratic Rep. Alexandria Ocasio-Cortez plans to offer her foreign policy vision at the Munich Security Conference this weekend as speculation grows about her political future. The 36-year-old New York progressive is popular with the Democratic base and has emerged as an influential voice of the opposition to President Donald Trump, leading some colleagues to encourage her to run for president — or perhaps the Senate — in 2028. Although she has been more outspoken on domestic issues, the Munich conference opens up a new door for one of the most recognizable figures in the Democratic Party. At a...