Hillary Rodham Clinton reacts to host Jon Stewart during a taping of "The Daily Show with Jon Stewart," in New York this month. (AP Photo/Frank Franklin II)

Former secretary of state Hillary Rodham Clinton responded Tuesday to Sen. Marco Rubio's charge that she is a "20th century candidate," suggesting that all elections are about what's next.

"I know that elections are about the future, and I would look forward in engaging in that kind of debate," Clinton said in an interview with "Airtalk" on Southern California public radio station KPCC.

Clinton said that voters need to evaluate a candidate's record to determine how the candidate will behave in the future.

"Every election is about the future. And certainly anyone who wishes to run for president has to make it clear how the experience that you've had in the past and what you believe and how you have acted on those beliefs will translate into positive results for the American people," Clinton said. "And I will be standing up and speaking out in favor of the changes that I think we need to make."

Clinton sounded like a presidential candidate, vowing to take on issues like student loan debt, immigration and improving the lives of middle class Americans. But she reiterated that has not decided whether she will run in 2016.

Rubio (R-Fla.), who is also a potential candidate, suggested in an interview broadcast earlier in the day that Clinton does not offer a forward-looking platform.

"I just think she's a 20th century candidate," Rubio told NPR in an interview published Tuesday. "I think she does not offer an agenda for moving America forward in the 21st century -- at least not up to now."

Rubio also criticized President Obama's foreign policy, insisting that Clinton has an "extremely vulnerable" record on that front.

Clinton responded by pointing to the accomplishment she details in her book, "Hard Choices."

"Maybe I should send a copy of it to my Republican friend," she quipped.