[ORBrit]

So I had to ride up to Portland for a client emergency - gorgeous day - sunshine and about 55 degrees.
The ride was about 110 miles from my house to the office. I got up there and fixed the problem and set off home about 5:45pm

I'm on the freeway for 100 miles and cruising along happily.

I exit the freeway and the first time I slow down and downshift, I notice my clutch is way spongy - very little resistance until about 2/3 of the way through the range of motion.
The shifter is way notchy too.
I notice as I come to a stop that I have to almost have the clutch lever pulled all the way in to disengage the clutch.

The next 15 minutes of in town riding, gets worse. The clutch is not fully disengaging when the lever is pulled in completely.
About 5 blocks from my house, I cannot shift at all - up or down.
I come to a stop sign and the bike stalls. I get it into Neutral, and with the clutch lever in, I kick it into first and the bike jumps forward, so I just go with it.
I try to shift -with no success. I try the engine kill switch - the bike keeps running (basically like a bump start). The clutch lever is completely useless.
I push the bike the last 2 blocks home.

I could have been stranded in Portland, 100 miles from home.

What do you think the problem is? Clutch fluid?

Bike is a 2007 Suzuki Boulevard S50.

Help!