Depending on political persuasion, the specter of the venerable Sen. Edward Kennedy, D-Mass., is engaging or infuriating. If the measure of a man is his friends and enemies, then Teddy Kennedy is giant among giants.

This week, Kennedy was diagnosed with a malignant brain tumor. It was only natural to see, a few days later, images of the legendary politician piloting his sailboat, appearing without a care in the world.

For anyone who wonders how to react, if given the direst news possible, Kennedy has given a great example.

Washington has been stunned by the news. For more than five decades, a Kennedy has resided in the U.S. Senate. When Teddy departs his seat, Capitol Hill will lose more than an experienced and influential leader.

It, and the country, will lose a bridge to a cherished past.

How many times, during this presidential campaign, have candidates been compared to John F. Kennedy in their speech, presentation or polish? And how many times has the boyish face of Bobby Kennedy beamed during discussions of political news? How many landmarks bear their family name?

Through their lives and accomplishments, John and Bobby Kennedy changed generations’ expectations and desires for presidential aspirants. They have, by their tragic ends, become yardsticks for all others that came after.

Then there is Teddy, whose contributions and controversy during his years in public service trumped his siblings. Yet he became their standard-bearer, amplifying their voices and ideals long after they were abruptly silenced.

In honoring the memory of John and Bobby Kennedy, it is hard not to admire Teddy Kennedy, who continued forward despite tragedy after tragedy, championing causes long before they came in vogue, and playing a hero and villain with aplomb and personality.

There has been nobody quite like him. It’s doubtful there ever will be again.

He is a flawed person. Chappaquiddick tailed him his entire life, with many questions about what happened that night still unanswered. His personal foibles became fodder for hundreds of late-night jokes and partisan attacks.

Yet, as many have said since the diagnosis, his contributions to the United States are innumerable and beyond value. He is a Kennedy, and all that comes with it. From particular ideological perspectives, this is good or bad.

There is one commonality, though, that must be adhered.

Teddy Kennedy deserves our respect, especially during this most difficult time.