Former President Obama on Monday issued a last-day message to Americans ahead of Election Day.

In a series of tweets, Obama noted that the “character of our country is on the ballot” and that this year’s midterms may be “the most important of our lifetimes.”

The former president made a similar pitch to voters at a rally in Chicago on Sunday while campaigning for gubernatorial candidate J.B. Pritzker and House candidates Sean Casten and Lauren Underwood.

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“When we've been at such crossroads before, Americans have made the right choice,” Obama tweeted. “Not because we sat back and waited for history to happen -- but because we marched, and mobilized, and voted. We made history happen.”

Obama listed a number of issues that he says Americans have the “power” to change if they vote, including criminal justice, workplace harassment, equal pay, college affordability, health care and gun violence.

When you vote, you have the power to protect voting rights. To make sure our criminal justice system treats everyone equally under the law. To strengthen laws that protect women in the workplace from harassment – and make sure they’re paid equally. — Barack Obama (@BarackObama) November 5, 2018

When you vote, you have the power to make it easier for a student to afford college, and harder for a disturbed person to shoot up a classroom. When you vote, you have the power to make sure a family keeps its health insurance. — Barack Obama (@BarackObama) November 5, 2018

If you take that power and vote, something powerful happens. Change happens. Hope happens. And with each new step we take in the direction of fairness, and justice, and equality, and opportunity, hope spreads. Go vote! https://t.co/NKXRGNgbZX — Barack Obama (@BarackObama) November 5, 2018

“If you take that power and vote, something powerful happens,” he tweeted. “Change happens. Hope happens. And with each new step we take in the direction of fairness, and justice, and equality, and opportunity, hope spreads.”

Obama has hit the campaign trail for a number of Democratic candidates this election cycle ahead of a tough midterm battle in which Democrats are seeking to take back the House.